Furnace.



F. E. BALDEN.

FURNACE.

APPLICATION FlLED NOV. 1. I916.

PatentedMay15,19l7.

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FRANK E. BALDEN. 0E PORTLAND, OREGON.

FURNACE.

Specification of Letters Patent.

Patented May I5, 1917.

Application filed November 1, 1916. Serial No. 128,871.

nomah, in the State of Oregon, have invented certain new and usefulImprovements in Furnaces, of which the following is a specification,reference being had to theaccoinpanyin g drawing.

My invention relates to furnaces generally, and particularly to fire boxboiler furnaces. Its object is to provide means in a furnace forrendering the heat generated in the medial portion of the fire boxavailable as a means for promoting a higher degree of combustion in thefurnace. This end I accomplish by providing above the grate asuper-heater, which, being exposed to the direct heat of the fire abovethe grate and receiving a supply of air from below the same, effects theresult of super heating the air and discharging it at the forward end ofthe super-heater into the combustion chamber of the furnace, therebystimulating the draft and producing a hot, clear fire.

My super-heater is preferably adjustable to different positions abovethe grate bars, and thereby affords means for cutting down the capacityof the furnace when it is desired to use. it for mild weather. Thisresult is accomplished in conjunction with its superheating function.

In the accompanying drawing,

Figure I is a side elevation, partly in section on line II of Fig. II ofthe fire box end of a boiler showing my super-heater in side elevation,but with the side exposed partially broken away to exhibit the interiorconstruction of the super-heater.

Fig. II is a transverse section on the, line II-II of Fig. I.

Fig. III is a partial view similar to Fig. II, showing one side of thefire box banked up to cut it out of service in order to reduce the sizeof the fire.

Fig. IV is a view similar to Fig. III, but showing the super-heatermoved to one side in order to effect a greater reduction in the size ofthe fire.

Referring to the numerals on the drawing, 1 indicates the wall of a firebox communicating with boiler tubes 2 through a boiler head 3 andprovided with a grate 4. The shape and dimensions of the fire box, itscombination with a boiler, and the construction of the grate are allnon-essential details, and, in the form in which they are illustrated inthe drawing, are presented only by way of example.

My invention consists of a super-heater 5 adapted to be introduced intothe interior of the fire box 1 above the grate 4:, where it issupported, preferably with an adjustability, upon any suitablesupporting members such for example as shelves 6.

The super-heater may be of any suitable and preferred shape, but Iprefer to make it in the shape of an inverted V shaped trough I as shownfor example in cdmparison of Figs. I and II. The member 5 preferablyextends lengthwise from front to rear of the interior of the fire boxand in cross-section is of the general triangular contour shown forexample in Fig. II. .The rear wall 7 of the super-heater is solid whilethe front wall 8, atthe opposite end thereof, is provided with a wideaperture 9. Between the front and rear walls I preferably provide one ormore partition walls 10, each having an aperture 11 correspondingsubstantially to the aperture 9 in the front wall 8. The bottom of thesuper-heater is preferably open and, extending asit does across a partof the bars of the grate 4, is adapted to receive influx of air frombelow the grate through the spaces provided between the bars. Thesuper-heater resting upon its shelves 6 may be embedded in the mass ofincandescent material 12 which during the operation of the furnace issupported upon the grate 4. Under such conditions the walls of thesuperheater are brought to a high temperature with the effect ofproducing a constant flow of air from below the grate through theseveral compartments, defined by the partitions 10, within thesuper-heater and its discharge through the aperture 9 into thecombustion chamber of the furnace. The result is to stimulate andpromote combustion to a high degree of perfection within the furnace.

A distinct advantage of my device is that in connection with itssuper-heating function, it is adapted to act as a reducer to the area ofthe grate. For example in Fig. III it is shown as medially located abovethe grate, so as to reduce the grate capacity by one half. This isaccomplished by filling in the fire box on one side of the superheaterwith dead matter, such for example, as ashes 14. By this means the fire15 is accommodated within one half the grate capacity of the fire box,while the superheater, exposed 011 one side to the heat of the fire 15,is enabled thereby to exert its superheating function to supplysuper-heated air to the interior of the fire box for the promoting ofcombustion therein. The effeet is to make it possible to carry a smallfire within the fire box with excellent effi ciency.

Fig. IV is designed only to illustrate the transverse adjustability ofthe super-heater whereby increased reduction of the effective area ofthegrate may be attained. In all other respects the description of theoperation employed with respect to Fig. III applies to Fig. IV.

The operation of my device requires little further description than thatgiven above. After the super-heater is set in position the fire is builtaround it, or against it, as the case may be, and the super-heatingeffect is produced automatically without the necessity of attention uponthe part of the fireman. The doorway 16 shown in Fig. I is, of course,in practice closed as usual by a door not illustrated.

If the efficient area of the grate is to be reduced, the filling l-l isput in place and afterward the fire is built and maintained in the usualway, the operation of the superheater being the same whether the wholeor only a part of the grate capacity he employed.

What I claim is:

1. As a new article of manufacture, a super-heater comprising an openbottomed member provided with imperforate side and rear walls, and witha perforated front Wall.

2. As a new article of manufacture, a super-heater comprising an openbottomed member provided with imperforate side and rear walls, and withperforated front and partition walls.

3. The combination with a furnace or the like and its grate, of asuper-heater having an open bottom adapted to rest upon the grate, andhaving imperforate side and rear walls, and a perforated front wall.

In testimony whereof, I have hereunto set my hand in the presence of twosubscribing witnesses.

FRANK E. BALDEN.

Witnesses ALEX. G. KIDDELL, JOHN B. CLELAND.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

